/*
 * @(#)HorizontalLayouter.java
 *
 * Copyright (c) 1996-2010 by the original authors of JHotDraw and all its
 * contributors. All rights reserved.
 *
 * You may not use, copy or modify this file, except in compliance with the 
 * license agreement you entered into with the copyright holders. For details
 * see accompanying license terms.
 */
package org.jhotdraw.draw.layouter;

import static org.jhotdraw.draw.AttributeKeys.COMPOSITE_ALIGNMENT;
import static org.jhotdraw.draw.AttributeKeys.LAYOUT_INSETS;

import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import org.jhotdraw.draw.AttributeKeys.Alignment;
import org.jhotdraw.draw.CompositeFigure;
import org.jhotdraw.draw.Figure;
import org.jhotdraw.geom.Dimension2DDouble;
import org.jhotdraw.geom.Insets2D;

/**
 * A {@link Layouter} which lays out all children of a {@link CompositeFigure}
 * in horizontal direction.
 * <p>
 * The preferred size of the figures is used to determine the layout. This may
 * cause some figures to resize.
 * <p>
 * The HorizontalLayouter honors the LAYOUT_INSETS and the COMPOSITE_ALIGNMENT
 * AttributeKey when laying out a CompositeFigure.
 * <p>
 * If COMPOSITE_ALIGNMENT is not set on the composite figure, the layout assigns
 * the same height to all figures.
 * 
 * 
 * @author Werner Randelshofer
 * @version $Id: HorizontalLayouter.java 718 2010-11-21 17:49:53Z rawcoder $
 */
public class HorizontalLayouter extends AbstractLayouter {

	@Override
	public Rectangle2D.Double calculateLayout(CompositeFigure compositeFigure, Point2D.Double anchor, Point2D.Double lead) {
		Insets2D.Double layoutInsets = compositeFigure.get(LAYOUT_INSETS);

		Rectangle2D.Double layoutBounds = new Rectangle2D.Double(anchor.x, anchor.y, 0, 0);
		for (Figure child : compositeFigure.getChildren()) {
			if (child.isVisible()) {
				Dimension2DDouble preferredSize = child.getPreferredSize();
				Insets2D.Double ins = getInsets(child);
				layoutBounds.height = Math.max(layoutBounds.height, preferredSize.height + ins.top + ins.bottom);
				layoutBounds.width += preferredSize.width + ins.left + ins.right;
			}
		}
		layoutBounds.width += layoutInsets.left + layoutInsets.right;
		layoutBounds.height += layoutInsets.top + layoutInsets.bottom;

		return layoutBounds;
	}

	@Override
	public Rectangle2D.Double layout(CompositeFigure compositeFigure, Point2D.Double anchor, Point2D.Double lead) {
		Insets2D.Double layoutInsets = compositeFigure.get(LAYOUT_INSETS);
		Alignment compositeAlignment = compositeFigure.get(COMPOSITE_ALIGNMENT);

		Rectangle2D.Double layoutBounds = calculateLayout(compositeFigure, anchor, lead);
		double x = layoutBounds.x + layoutInsets.left;
		for (Figure child : compositeFigure.getChildren()) {
			if (child.isVisible()) {
				Insets2D.Double insets = getInsets(child);
				double width = child.getPreferredSize().width;
				double height = child.getPreferredSize().height;
				// --
				switch (compositeAlignment) {
				case LEADING:
					child.setBounds(new Point2D.Double(x + insets.left, layoutBounds.y + layoutInsets.top + insets.top),
							new Point2D.Double(x + insets.left + width, layoutBounds.y + layoutInsets.top + insets.top + height));
					break;
				case TRAILING:
					child.setBounds(new Point2D.Double(x + insets.left, layoutBounds.y + layoutBounds.height - layoutInsets.bottom
							- insets.bottom - height), new Point2D.Double(x + insets.left + width, layoutBounds.y + layoutBounds.height
							- layoutInsets.bottom - insets.bottom));
					break;
				case CENTER:
					child.setBounds(new Point2D.Double(x + insets.left, layoutBounds.y + layoutInsets.top + (layoutBounds.height - height)
							/ 2d), new Point2D.Double(x + insets.left + width, layoutBounds.y + layoutInsets.top
							+ (layoutBounds.height + height) / 2d));
					break;
				case BLOCK:
				default:
					child.setBounds(new Point2D.Double(x + insets.left, layoutBounds.y + layoutInsets.top + insets.top),
							new Point2D.Double(x + insets.left + width, layoutBounds.y + layoutBounds.height - layoutInsets.bottom
									- insets.bottom));
					break;
				}
				// ---
				x += width + insets.left + insets.right;
			}
		}

		return layoutBounds;
	}
}
